Newly observed irrational crystallographic features of non-basal Mg2Sn precipitates in a Mg-4Sn alloy aged at 160 °C
| Autor: | Weigang Huang, Xuefei Huang, Baoqin Fu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Long axis
Materials science Polymers and Plastics Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Crystallography Mechanics of Materials Materials Chemistry Ceramics and Composites engineering Basal plane 0210 nano-technology |
| Zdroj: | Journal of Materials Science & Technology. 77:237-243 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2020.09.050 |
| Popis: | Two novel types of irrational orientation relationships (ORs) between β-Mg2Sn precipitates and the α-Mg matrix were observed in a Mg-4Sn alloy aged at 160℃. In contrast to that for the dominant β-Mg2Sn laths lying on the (0001)α basal plane of the matrix, the precipitates with the irrational ORs are inclined or normal to (0001)α. Specifically, the precipitates that adopt the OR of [011]β// 2 1 ¯ 1 ¯ 0 α , with 1 ¯ 1 1 ¯ β deviating approximately 4.7° from (0002)α, have a long axis parallel to [0001]α. The precipitates with the OR of [011]β// 2 1 ¯ 1 ¯ 0 α , with 11 1 ¯ β deviating approximately 13.5° from (0002)α, exhibit a long axis of 02 2 ¯ 1 α . Both types of precipitates have a habit plane (HP) of 2 1 ¯ 1 ¯ 0 α . The interface orientations of the precipitates associated with the irrational ORs are interpreted by a good matching sites (GMS) method. A thorough examination of the crystallographic features of the β-Mg2Sn precipitates in the literature shows that the precipitates with most rational ORs have a HP parallel to (0001)α, and those with most irrational ORs have a HP (or long axis) inclined or normal to (0001)α. The preferences of the precipitates with different irrational ORs have also been analyzed by examining the lattice matching condition across the interfaces between the precipitates and the matrix. |
| Databáze: | OpenAIRE |
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